It is not possible to restore a deleted sprint in JIRA. The only thing that you can do is load a XML backup somewhere. Do notice that when loading an XML backup, this will replace your current environment data.
If this is not an option, you should rebuild the sprint.
I did the same thing, quite accidentally, from the "Sprint Report". The name of the sprints was wrong in one of my projects and when I fixed it, I deleted the other incorrect sprints from the report....or as it turned out, altogether. The sprint report appears to be for a single project, but in fact, it is for all projects. Further, quite honestly, I don't believe one should be allowed to delete a sprint from within report. The implication is that something is being deleted from a report, not the item itself.
So, our velocity data is now missing from our first two sprints.
Is there really no better solution than restoring some backed up XML (by the way, we use Jira Cloud)?
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